Improvement im rowlocks



A clarethe following to be a full, clear, and expart of this specitication, in whichupright d and its pivots, and the supplemental brace g. The oar-lock is capable of turning MICHAEL F. DAvIs, on PonTLAND, MAINE IMPROVEMENT EN ROWLOCKS.

Specification forming part of Letters Patent No. 165,072, dated June 29, 1875; application tiled April 7, 1874:

To all whom lit may concein shown atj. The top piece is offset on the out- Be it known that I, MICHAEL F. DAVIS, of ward side of the standard d, so as to give the Portland, in the county-ot' Cumberland and State of Maine, have invented a new and useful Improved Oar-Lock; and I do hereby deact `description oi' the same, reference being made to the accompanyingdrawing forming Figure lis a side elevation 5 Fig. plan.

Same letters show like parts.

The object of my invention isto produce an oarlock of improved construction and operation. y A

The oar-lock consists ot a rectangular frame, A, composed oi' the parts a' b c d. Thisis set into a plate or foot, B, and turns in the foot on the pivot e. This foot is to be secured to the Outrigger or gunwale. The upright part d has also a pivot, f, which works in a hole in the horizontal arm of the brace g. This brace is also to 'be secured to the foot B, and screwed to the Outrigger or gunwale by means ot` a nut and washers or any other convenient method. The upright d receives the bearing of the oar while the stroke'is being made.

It will' be seen that the pressure of A-thc stroke is `sustained by the combination ofthe 2, a top to a certain extent upon its two pivots aand fas the stroke is made, turning outwardly or away from the gunwale when the oar is thrown back preparatory to the stroke, and slowly swinging inward as the oar goes through the Water.

Y The top piecec is 'turned one side to admit the beam ot' the oar into the lock, and, when the oar is once placed within the lock, this top piece is.swung around, so as to cover the top of the oar-lock, and the hook h is passed into a hole in the stud t, so asto keep it in position.

The hinge upon which the toppiece turns is largest space for the oar-beam, and so as not to interfere with the inclination of the oar from the lock downward to the surface of the water.

The top piece c may be made rigid on the standard d, and a narrow opening made at the angle between it and the part b, so as to admit the blade ot' the oar edgewise into the lock. The Voar is then pushed ont through the lock as far as desired.

I make my lock rectangular in shape, thus forming but three bearings for the round beam of the oar, and so diminishing considerably the friction of the beam within the lock.

is shows a brace projecting from the lowerend ot the standard d, which regulates the extent to which the lock can turn or swing by contact with the supplemental brace g. This brace 7c can be made adjustable, in order to increase or diminish atwill the extent to which the lock can be swung.

It will be seen that the bearings ot' the oarlock in the gunwale or Outrigger are on the forward side of the lock, which serves to diminish the leverage or strain upon the Woodwork ot therail, or upon the Outrigger. This is an advantage over the common oar-lock in use, which has a pivot in the center.

What I`claimA as my invention, and 'desire to secure by Letters Patent, is

l.V The combination of the brace or arm g, aftiXed to the boat, with the rowlock a b d, and pivoted-or hinged top piece c, hook h, and stud d, substantially in the manner and for the purposes set forth.

2. In combination with a-rowlock, substantially as described, the spir 7c.

MICHAEL F. DAVIS. Witnesses: f

FRANK H. JORDAN, EDGAR S. BRowN.

ATENTM' @FFI i 

